I actually get this question in email often. I always say it depends on your goals. If you are looking for a solid strength and conditioning base with steady but gains, but not rapid - Eo3 WODs.
OMOB can pack on some serious strength and is a great program to come back to over and over, and the conditioning is great to repeat to actually see how much better you have gotten.
I know a lot of people who do OMOB then cycle off to EO3, then get back to OMOB and that's actually kind of what I do. Currently I'm on like my 8th or 9th unbroken cycle of OMOB this year and will need a break soon.
Next year's OMOB update will have a TON of conditioning workouts tailored to each lift you can do in the OMOB program. So you will have nearly endless options in OMOB conditioning soon.
Hope that helps! I would love to hear some other chime in with their experiences too.